Development of TB Vaccine Hits Snag

LONDON—Efforts to develop the first new tuberculosis vaccine in 90 years stumbled on Monday when the most advanced vaccine in testing failed to protect infants in a clinical study.

Researchers called the results disappointing but suggested the vaccine, called MVA85A and developed by Oxford University, could still prove useful if further tests confirm its efficacy in adults. In a number of small, preliminary studies, the vaccine...